Kevin R. Hayden (born c. 1968) is an American lawyer currently serving as District Attorney for Suffolk County, Massachusetts, after being appointed by Governor Charlie Baker.

[3] Hayden grew up in Newton, Massachusetts, and spent time in the Roxbury neighborhood of Boston when his father moved there following his parents’ divorce.

[9] Hayden received endorsements from elected officials including State Senator Will Brownsberger and Boston City Councilors Frank Baker and Erin Murphy.

[4] The campaign was marked by controversy, especially after The Boston Globe received records of two investigations of Arroyo for committing sexual assault when he was teenager.

[15] Following the Democratic primary election held on September 6, and with results showing Hayden with a lead of approximately seven points (53.8% to 46.2%), Arroyo conceded the race via Twitter the following morning.

Despite strong evidence of misconduct, Hayden's assistant DA Kevin Mullen indicated to attorneys for both Green and Davis that they would not be proceeding to prosecute the case.

Interim US Attorney Joshua Levy stated, "For the good of the community and all the honorable officers and supervisors in the police ranks, misconduct of this nature cannot be tolerated.